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Home >> Ford >> 2018 >> Fiesta Titanium, 4D Hatchback, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Cooling - 1.6L ECOBOOST (132KW/180PS) - Sigma) >> Diagnosis And Testing >> Engine Cooling >> Component Tests >> Cooling System Pressure Test

Cooling System Pressure Test

WARNING: This page is about a different variant/trim than selected.
WARNING: When releasing the cooling system pressure, cover the coolant expansion tank cap with a thick cloth.
NOTE: Vehicles have a pressure relief cap on the degas bottle and no radiator cap.
  1. Turn the engine OFF.
  2. Check the engine coolant level and adjust as necessary.
  3. Remove the degas bottle cap. Inspect the degas bottle cap and degas bottle for any issues that would cause improper sealing, such as for cross-threading, burrs, damaged O-ring, etc. If any issues are found, INSTALL a new cap and/or degas bottle.
  4. Attach the Pressure Tester and adaptor (Snap-On TA53 or equivalent), to the degas bottle cap. The cap must hold the specified pressure. REFER to: Specifications . If any issues are found, INSTALL a new cap.
  5. Install degas bottle cap and run engine until normal operating temperature is reached.
  6. Turn the engine off.
  7. Attach the Pressure Tester and adaptor (Snap-On TA52, AST ASSFZ-47, Redline RDL95-0750 or equivalent) to the degas bottle.
    GFD300792Courtesy of FORD MOTOR COMPANY
    NOTE: If the plunger of the pressure tester is pressed too fast, an erroneous pressure reading will result.
  8. To pressurize the engine cooling system, slowly press the plunger of the pressure test pump and increase the pressure to 145 kPa (21 PSI). Allow the system to stabilize for approximately 2 minutes. Re-pressurize to 21 psi. Pressure should not drop within the next 2 minutes. If the pressure drops, inspect for external leaks and repair as necessary.
  9. Allow the vehicle to sit for a minimum of 5 hours, or overnight.
    NOTE: 2-4 psi of pressure drop is normal and expected after engine cool down.
  10. If the pressure drops more than the expected range of 2-4 psi and no external leaks are found, the leak may be internal to the engine. Using a borescope remove the spark plugs and inspect the cylinder combustion chambers for coolant intrusion. REFER to: Engine .
  11. If pressure remains in the cooling system, remove the cooling system pressure tester and adaptor from the degas bottle.
  12. Install the degas bottle cap until it contacts the hard stop.
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